De Novo Mutations in Moderate or Severe Intellectual Disability e1004772

Genetics is believed to have an important role in intellectual disability (ID). Recent studies have emphasized the involvement of de novo mutations (DNMs) in ID but the extent to which they contribute to its pathogenesis and the identity of the corresponding genes remain largely unknown. Here, we re...

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Published inPLoS genetics Vol. 10; no. 10
Main Authors Hamdan, Fadi F, Srour, Myriam, Capo-Chichi, Jose-Mario, Daoud, Hussein, Nassif, Christina, Patry, Lysanne, Massicotte, Christine, Ambalavanan, Amirthagowri, Spiegelman, Dan, Diallo, Ousmane, Henrion, Edouard, Dionne-Laporte, Alexandre, Fougerat, Anne, Pshezhetsky, Alexey V, Venkateswaran, Sunita, Rouleau, Guy A, Michaud, Jacques L
Format Journal Article
LanguageEnglish
Published San Francisco Public Library of Science 01.10.2014
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Abstract Genetics is believed to have an important role in intellectual disability (ID). Recent studies have emphasized the involvement of de novo mutations (DNMs) in ID but the extent to which they contribute to its pathogenesis and the identity of the corresponding genes remain largely unknown. Here, we report a screen for DNMs in subjects with moderate or severe ID. We sequenced the exomes of 41 probands and their parents, and confirmed 81 DNMs affecting the coding sequence or consensus splice sites (1.98 DNMs/proband). We observed a significant excess of de novo single nucleotide substitutions and loss-of-function mutations in these cases compared to control subjects, suggesting that at least a subset of these variations are pathogenic. A total of 12 likely pathogenic DNMs were identified in genes previously associated with ID (ARID1B, CHD2, FOXG1, GABRB3, GATAD2B, GRIN2B, MBD5, MED13L, SETBP1, TBR1, TCF4, WDR45), resulting in a diagnostic yield of ~29%. We also identified 12 possibly pathogenic DNMs in genes (HNRNPU, WAC, RYR2, SET, EGR1, MYH10, EIF2C1, COL4A3BP, CHMP2A, PPP1CB, VPS4A, PPP2R2B) that have not previously been causally linked to ID. Interestingly, no case was explained by inherited mutations. Protein network analysis indicated that the products of many of these known and candidate genes interact with each other or with products of other ID-associated genes further supporting their involvement in ID. We conclude that DNMs represent a major cause of moderate or severe ID.
AbstractList Genetics is believed to have an important role in intellectual disability (ID). Recent studies have emphasized the involvement of de novo mutations (DNMs) in ID but the extent to which they contribute to its pathogenesis and the identity of the corresponding genes remain largely unknown. Here, we report a screen for DNMs in subjects with moderate or severe ID. We sequenced the exomes of 41 probands and their parents, and confirmed 81 DNMs affecting the coding sequence or consensus splice sites (1.98 DNMs/proband). We observed a significant excess of de novo single nucleotide substitutions and loss-of-function mutations in these cases compared to control subjects, suggesting that at least a subset of these variations are pathogenic. A total of 12 likely pathogenic DNMs were identified in genes previously associated with ID (ARID1B, CHD2, FOXG1, GABRB3, GATAD2B, GRIN2B, MBD5, MED13L, SETBP1, TBR1, TCF4, WDR45), resulting in a diagnostic yield of ~29%. We also identified 12 possibly pathogenic DNMs in genes (HNRNPU, WAC, RYR2, SET, EGR1, MYH10, EIF2C1, COL4A3BP, CHMP2A, PPP1CB, VPS4A, PPP2R2B) that have not previously been causally linked to ID. Interestingly, no case was explained by inherited mutations. Protein network analysis indicated that the products of many of these known and candidate genes interact with each other or with products of other ID-associated genes further supporting their involvement in ID. We conclude that DNMs represent a major cause of moderate or severe ID.
Author Ambalavanan, Amirthagowri
Venkateswaran, Sunita
Nassif, Christina
Dionne-Laporte, Alexandre
Fougerat, Anne
Capo-Chichi, Jose-Mario
Patry, Lysanne
Henrion, Edouard
Daoud, Hussein
Spiegelman, Dan
Rouleau, Guy A
Hamdan, Fadi F
Srour, Myriam
Massicotte, Christine
Michaud, Jacques L
Diallo, Ousmane
Pshezhetsky, Alexey V
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Copyright 2014 Public Library of Science. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited: Mutations in Moderate or Severe Intellectual Disability. PLoS Genet 10(10): e1004772. doi:10.1371/journal.pgen.1004772
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Snippet Genetics is believed to have an important role in intellectual disability (ID). Recent studies have emphasized the involvement of de novo mutations (DNMs) in...
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